1. had done means "should have done but didn't do it". According to the original words, "it should have been completed in 2002 1 month, but three years later, the result is still not completed." "I'm going to do it. ......

2.2. The tense in the conditional adverbial clause guided by if should be the simple present tense, indicating the meaning of the future.

3. The main clause is the past tense, and the clauses use the corresponding past tense. The dream they had lasted from a certain moment in the past until they were asked. The action of "dream" was always in progress, so the past perfect continuous tense was used.